Title: Radiation process for producing 1,2-polybutadiene foamed products

Abstract: A process for producing a photodegradable rubber foamed products of excellent softness, which comprises mixing 1,2-polybutadiene with 0.1 to 3.0% of a photosensitizer and with a thermally decomposable foaming agent, irradiating with ultraviolet ray of a wavelength of 240 to 400 m.mu. for 10 minutes or less to form a cross-linked material having a gel fraction of 30 to 80% (in boiling toluene; 7 hours), and heating to 150 to 230.degree. C. to form a foamed product. In particularly preferred embodiments of this invention, the foaming agent is p,p'-oxybis (benzenesulfonylhydrazide).

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Inventors: Shikinami, Yasuo (Kusatsu, JP)
Kimura, Ryuichi (Kyoto, JP)
Yoshikawa, Yoshinobu (Azuchi, JP)
Iida, Kosuke (Azuchi, JP)
Hata, Kunihiro (Azuchi, JP)

Application Number: 728653
Filing Date: 1976-10-01
Publication_date: 1979-03-13
Assignee: Takiron Co., Ltd. (Azuchi, JP)
Primary Class(es): 521/50.5 260/DIG43, 521/150, 521/915, 521/916, 522/48, 522/68
Other Classes:
US Patent Ref:

3098831	Jul, 1963	Carr	260/2.
3240727	Mar, 1966	Scalani	260/2.
3542702	Nov, 1970	Okada et al.	260/2.
3562367	Feb, 1971	Shinohara et al.	204/159.
3709806	Jan, 1973	Minami et al.	260/2.
3717559	Feb, 1973	Oyama et al.	260/2.
3798187	Mar, 1974	Miyoshi et al.	260/2.
3816284	Jun, 1974	Kagiya et al.	260/2.
3832312	Aug, 1974	Wright	260/2.
3852227	Dec, 1974	Matsuda et al.	260/DIG.
3888804	Jun, 1975	Swanholm et al.	260/2.
3891724	Jun, 1975	Yaeda et al.	260/2.
3891830	Sep, 1976	Takeuchi et al.	260/2.
4023973	May, 1977	Imaizumi et al.	204/159.
4024324	May, 1977	Sparks	204/159.
4029840	Jun, 1977	Shikinami et al.	428/310.

Other Refs:
Primary Examiner: Turer, Richard B.
Assistant Examiner:
Attorney: Sughrue, Rothwell, Mion, Zinn and Macpeak